Sharpie

“wait, boss, WAIT!” but it was too late. the boss had written on the white board with a Sharpie®. and now, “MAKE YOUR DAMN NUMBERS!” was permanent forever. this is what you want sometimes. but do not leave one around for the daft or too busy to pay attention person in charge.

it used to be that Sharpie came only in black. there was FAT version and not so. today it comes colors, extra wide, really fine, and lots of between.